I mostly play halo for the creativity. I dont like the actual competitiveness of it and 95% of the time im in forge the last 5% is playing infection/grifball.

The creativity element of it is great. Halo has such a great engine, allowing amazing things to happen and its forge mode was great. And from what I have heard of the new version, it has been far improved again...
In my time of halo3 I played roughly 1500 ranked matches, 1500 social matches and 1500 custom games... However I did have some very long sprints in forge.

I so want reach, but I cant afford it for a few weeks... someone buy me it please?

I have Reach, its pretty good.. I've only played the campaign aspect so far but from what I've read/heard the forge section and the online part are supposed to be really good (especially the expansion of forge). But thats just what I've read.. I'll find out later after I beat the campaign (I always do the campaign first then do the rest..)

In regards to playing it together.. I hardly ever have a chance to play anything it seems so once DoF is in Phase 3 any available gaming hours = there